Node.js – util.types.isDataView() Method

The util.types.isDataView() method checks whether the passed value is a built-in DataView instance or not. If the above condition is satisfied, it returns True, else False.

Syntax

util.types.isDataView(value)

Parameters

• value − This input value takes input for the required parameter and checks if it's a Data View instance or not.

It returns True or False based upon the input value passed.

Example 1

Create a file named "isDataView.js" and copy the following code snippet. After creating the file, use the command "node isDataView.js" to run this code.

// util.types.isDataView() Demo Example

// Importing the util module
const util = require('util');

const buffer = new ArrayBuffer(20);

// Passing an array buffer in data view
console.log("1." + util.types.isDataView(new DataView(buffer)));

// Passing an array buffer
console.log("2." + util.types.isDataView(buffer));

// Passing a Float64 Array Buffer
console.log("3." + util.types.isDataView(new Float64Array()));

Output

C:\home
ode>> node isDataView.js
1.true
2.false
3.false

Example 2

// util.types.isDataView() Demo Example

// Importing the util module
const util = require('util');

var buffer = new ArrayBuffer(16);
var view = new DataView(buffer, 0);

view.setInt16(1, 42);
view.getInt16(1); // 42

// Passing a data view
console.log("1." + util.types.isDataView(view));

// Passing an element retrieved from dataview
console.log("2." + util.types.isDataView(view.getInt16(1)));

// Passing an Array Buffer
console.log("3." + util.types.isDataView(new ArrayBuffer()));

Output

C:\home
ode>> node isDataView.js
1.true
2.false
3.false